Method of texturing an inner surface of a self-expanding implant delivery system outer sheath
a delivery system and inner surface technology, applied in the field of medical devices, can solve the problems of deflection of the delivery system during deployment, inconvenient placement of intraluminal medical devices, and friction between the medical device and the outer sheath, and achieve the effect of reducing the friction between the medical device and the outer sheath
Active Publication Date: 2014-06-26
COOK MEDICAL TECH LLC
View PDF4 Cites 17 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The patent describes a method for creating a textured surface on the inside of a sheath. A sleeve with a textured pattern on its outer surface is placed over a mandrel, and then the sleeve is squeezed onto the mandrel to create a textured surface on the inside of the sleeve. Afterward, the mandrel is withdrawn from the sleeve. This method may be useful for creating a textured surface on the inside of a sheath for various applications.
Problems solved by technology
One problem that can contribute to imprecise placement of intraluminal medical devices is deflection of the delivery system during deployment.
This can be a particular problem in the deployment of self-expanding medical devices, like stents, because the medical device presses outward against the inner surface of the outer sheath prior to deployment.
When the outer sheath is withdrawn, the outward pressure exerted by the medical device creates friction between the medical device and the outer sheath.
This can cause the inner catheter to contract in length due to the compressive force.
Although the contraction and buckling may decrease somewhat as the outer sheath begins to withdraw from the medical device due to the release of some of the frictional force, the distal end of the inner catheter may not completely return to the intended treatment site when the medical device is initially released and implants within the patient's body.
With medical devices that cause high frictional loads against the outer sheath, like drug coated stents, covered stents and particularly long stents, the initial deflection of the delivery system and subsequent distal movement due to the release of friction can make it difficult for a physician to predict the exact location where the medical device will be released in a patient's body.
However, forming a textured surface on the inner surface of an outer sheath is a difficult process that has limited the use of this possible improvement in self-expanding implant delivery systems.
For example, while methods for texturing outer surfaces like cylindrical rods and tubes are relatively straightforward, forming a textured surface inside the lumen of a small sheath is much more difficult.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0016]Referring now to the figures, and particularly to FIG. 1, a cross-sectional view of a sheath 10 being formed with a texture 12 along at least a portion of the inner surface of the sheath 10 is shown. While the sheath 10 is preferably envisioned as an outer sheath 10 for a self-expanding implant delivery system, it is possible that the textured sheath 10 may be useful in other devices as well. The sheath 10 may be made up of one or more layers 14, 16, or sleeves 14, 16, and may include various types of reinforcement structures 16 if desired. For example, in the embodiment shown in FIG. 1, the sheath 10 may have an inner sleeve 14 and an outer sleeve 16 with a reinforcement structure 18, such as a coil or a braid, between the inner and outer sleeves 14, 16.
[0017]Preferably, the inner sleeve 14 has a higher melting temperature than the outer sleeve 16. For example, the inner sleeve 14 may be made from a polymeric material, such as polytetrafluoroethylene (PTFE), ethylene tetraflu...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| melting temperature | aaaaa | aaaaa |
| melting temperature | aaaaa | aaaaa |
| melting temperature | aaaaa | aaaaa |
Login to View More
Abstract
A method of forming a textured surface on the inner surface of a sheath is provided. The sheath may be used in a delivery system to restrain a self-expanding medical implant in a compressed state. In the method, a sleeve is squeezed against a textured pattern on a mandrel to form a textured surface on the inner surface of the mandrel. The diameter of the mandrel is then contracted before the mandrel is removed from the sleeve.
Description
BACKGROUND[0001]The present invention relates generally to medical devices and more particularly to delivery systems for medical devices.[0002]Intraluminal medical devices are used by physicians to treat numerous conditions using minimally invasive procedures. Examples of intraluminal medical devices include stents, stent-grafts, filters, valves, etc. One type of intraluminal medical device that has become especially common is self-expanding stents. Typically, self-expanding medical devices, including stents, are made from an elastic structure that may be compressed into a low profile state that can be passed through vessels in a patient with minimal trauma. Once at the desired treatment site, the self-expanding medical device is released and self-expands like a spring until it contacts a tissue wall which prevents further expansion. Common materials that are used in self-expanding medical devices include nitinol and stainless steel, although other materials are also possible.[0003]...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & AuthorityApplications(United States)
IPC IPC(8): B23P11/00
CPCB23P11/00A61F2/95A61F2002/9665A61F2240/001Y10T29/49863
InventorMERK, JAMES C.IRWIN, NATHANIEL A.
OwnerCOOK MEDICAL TECH LLC